I have been working with and researching the Ecological Footprint (60% carbon footprint globally) for a decade. Base on this tool, a visual message can be portrayed in planet earths, or on a map in global hectares. Excellent communication tool when referring to carbon emissions, as, how does one visualize a ton of carbon (I have seen balloons and house size attempts) Check out a sample display in “How Many Planets?” https://0urnearfuture.wordpress.com/academic/